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1. 
What is the primary purpose of respiration?
A.
To store nutrients.
B.
To create oxygen.
C.
To remove carbon dioxide.
D.
To produce energy for cellular activities.
2. 
Which gas is primarily exchanged during respiration?
A.
Oxygen.
B.
Hydrogen
C.
Nitrogen
D.
Carbon monoxide
3. 
What is the site of gas exchange in the lungs?
A.
Trachea
B.
Bronchi
C.
Alveoli.
D.
Larynx
4. 
What process occurs in the mitochondria?
A.
Photosynthesis
B.
Fermentation
C.
Anaerobic respiration
D.
Aerobic respiration.
5. 
What is the byproduct of aerobic respiration?
A.
Carbon dioxide.
B.
Glucose
C.
Lactic acid
D.
Oxygen
6. 
Which type of respiration does not require oxygen?
A.
Anaerobic respiration.
B.
Aerobic respiration
C.
Photosynthesis
D.
Cellular respiration
7. 
What role do capillaries play in gaseous exchange?
A.
They facilitate the exchange of gases between blood and alveoli.
B.
They store oxygen.
C.
They transport nutrients.
D.
They produce carbon dioxide.
8. 
Which organ is primarily responsible for gas exchange?
A.
Kidneys
B.
Heart
C.
Liver
D.
Lungs.
9. 
What is the main function of hemoglobin?
A.
To digest food.
B.
To produce carbon dioxide.
C.
To filter blood.
D.
To transport oxygen in the blood.
10. 
What is the term for the movement of gases from high to low concentration?
A.
Diffusion.
B.
Active transport
C.
Osmosis
D.
Filtration